Screen is used for the Screening Operation. Screening is the first operation at any wastewater treatment works. This process essentially involves the removal of large non-biodegradable and floating solids that frequently enter a wastewater works, such as rags, papers, plastics, tins, containers and wood.
Efficient removal of these constituents will protect the downstream plant and equipment from any possible damage, unnecessary wear & tear, pipe blockages and the accumulation of unwanted material that will interfere with the required wastewater treatment processes.
Wastewater screening is generally classified into either coarse screening or fine screening. Screens may be manually or mechanically cleaned, with only the older and smaller treatment facilities using manually cleaned screens as their primary or only screening device. Coarse screens are typically used as primary protection devices, and usually have openings of 10mm or larger.